I have a TDA-200, with a KX-TDA0172 16 port digital extension card. My problem is that the digital extensions don't work.

I have 6 digital phones model: KX-T7630X.

To start with, I don't know now even if I have to use 1 pair (2 wires) or 2 pairs(4 wires).

In the installation manual for the card, there is the pinout for the amphenol and it says:

1 D2A Data port 1 (Low) 26 D1A Data port 1 (High)
2 D2B Data port 2 (Low) 27 D1B Data port 2 (High)
3 D2C Data port 3 (Low) 28 D1C Data port 3 (High)
4 D2D Data port 4 (Low) 29 D1D Data port 4 (High)
......

So from this I assume 1 pair, but it has not work.

I'm following this wiring code:
wiring code

What do I need to do to make'em work?

Thanks.